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Proceedings Paper

High dynamic range two-stage photopolymer materials through enhanced solubility high refractive index writing monomers
Author(s): Marvin D. Alim; Sudheendran Mavila; David J. Glugla; Chen Wang; Philip D. Nystrom; Amy C. Sullivan; Christopher N. Bowman; Robert R. McLeod
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Paper Abstract

Holographic photopolymers capable of high refractive index modulations (Δn) on the order of 10-2 are integral for the fabrication of functional holographic optical elements (HOEs) for use in a range of optical applications. A novel high refractive index liquid writing monomer suitable for two-stage photopolymer systems was designed and synthesized. This monomer exhibits facile synthetic procedure, low viscosity, high refractive index as well as excellent solubility in a low refractive index urethane matrix. The solubility limit, refractive index change and reaction kinetics/conversion were studied against a commercial reference high refractive index monomer, 2,4,6-tribromophenyl acrylate (TBPA). Superior performance in solubility to TBPA is shown with similar reaction kinetics and final conversion as confirmed by realtime Fourier transform infrared spectroscopy (FTIR) and real-time monitoring of diffraction grating growth. We demonstrate the ability to load substantial amounts of these writing monomers enabling a straightforward path to higher achievable Δn values (peak-to-mean Δn ~ 0.03) without sacrificing optical properties (transparency, color or scatter) as validated through recording ~100% efficiency volume transmission holograms in sub-15 μm thick films.

Paper Details

Date Published: 19 February 2018
PDF: 7 pages
Proc. SPIE 10558, Practical Holography XXXII: Displays, Materials, and Applications, 105580D (19 February 2018); doi: 10.1117/12.2290029
Show Author Affiliations
Marvin D. Alim, Univ. of Colorado Boulder (United States)
Sudheendran Mavila, Univ. of Colorado Boulder (United States)
David J. Glugla, Univ. of Colorado Boulder (United States)
Chen Wang, Univ. of Colorado Boulder (United States)
Philip D. Nystrom, Univ. of Colorado Boulder (United States)
Amy C. Sullivan, Univ. of Colorado Boulder (United States)
Christopher N. Bowman, Univ. of Colorado Boulder (United States)
Robert R. McLeod, Univ. of Colorado Boulder (United States)

Published in SPIE Proceedings Vol. 10558:
Practical Holography XXXII: Displays, Materials, and Applications
Hans I. Bjelkhagen; V. Michael Bove, Editor(s)

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